Let \(\rho \,=\, (a_1, \,\dots ,\, a_g,\, b_1,\, \dots ,\, b_g)\)  (as above).
The extended moduli space is singular at the point \((\rho ,\, \overline{k}, \,\overline{\lambda }) \) 
([1]}, Theorem 5.2) when either:
